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T&D World Magazine

Metal-Clad Switchgear

Siemens Power Transmission & Distribution Inc. introduces its next-generation medium-voltage air-insulated switchgear, the GM-SG. Based on the Siemens GM switchgear design, the GM-SG uses the Siemens 3AH3 operator. The German-designed 3AH3 operator is used in eight circuit breaker and switchgear products around the world. The 3AH3 operator enables the GM-SG to provide significantly higher performance, including faster interrupting times and higher interrupting currents. More than 160,000 3AH3 breaker operators have been delivered to customers worldwide since its launch in 1998.

The GM-SG will initially be offered at 5 kV and 15 kV, with rated currents up to 3000 A and self-cooled and interrupting currents up to 50 kA with three-cycle interruption. Deliveries start in early 2007. This will be followed by a two-high arc-resistant version as well as a 63 kA interrupting rating later in 2007.

Siemens Power T&D Inc.

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